检索结果-南通市图书馆

Anchoring Ru clusters to highly defective N-doped carbon nanotubes via a thermal-shock strategy for stable industrial hydrogen evolution

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第6期17卷 5261-5269页

作者： zhiming li Xinyu li Haiqing Ma Chenliang Ye Hongan Yu Long Nie Meng Zheng Jin Wang College of Materials science and Engineering Shenzhen UniversityShenzhen 518060China School of Chemistry and Materials science Anhui Normal UniversityWuhu 241002China Department of Power Engineering North China Electric Power UniversityBaoding 071003China

Non-Pt or low-Pt catalysts capable for stable generation of hydrogen via water electrolysis at an industrial level of current density are highly *** of strong metal-support connection is beneficial to improve the performance stability of *** we employed highly defective N-doped carbon nanotubes(d-N-CNT)as the support to achieve uniform and firm anchoring of Ru clusters(~1.9 nm)via a thermal-shock *** as-prepared Ru/d-N-CNT catalyst shows excellent catalytic activity for hydrogen evolution reaction(HER)in alkaline media and requires an overpotential(ƞ)of 12 mV at 10 mA·cm^(−2)and 116 mV at 200 mA·cm^(−2)with a Ru loading of 0.025 mg·cm^(−2).Impressively,Ru/d-N-CNT presents robust stability for HER at both low current density(stable for at least 1000 h at 10 mA·cm^(−2))and the industrial level of current density(stable for at least 100 h at 1000 mA·cm^(−2)),remarkably outperforming commercial Pt/C and Ru/*** highly defective nature of the N-CNT support endowed the as-prepared Ru/d-N-CNT catalyst with strong metal-support adhesion that efficiently suppressed agglomeration as well as obscission of Ru ***,the rich defects increased the surface energy of the N-CNT support and resulted in improved hydrophilicity as evidenced by the liquid contact angle measurement and the bubble evolution process,which also played an important role in stabilizing the HER performance especially at large current density.

关键词： thermal-shock method hydrogen evolution reaction large-current-density Ru cluster

Cross-domain diagnosis for polymer electrolyte membrane fuel cell based on digital twins and transfer learning network

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Energy and AI 2024年第3期17卷 555-568页

作者： Zhichao Gong Bowen Wang Mohamed Benbouzid Bin li Yifan Xu Kai Yang zhiming Bao Yassine Amirat Fei gao Kui Jiao State key laboratory of Engines Tianjin University135 Yaguan RoadTianjin300350China University of Brest UMR CNRS 6027 IRDL29238BrestFrance National Industry-education Platform for Energy Storage Tianjin University135 Yaguan RoadTianjin300350China The key laboratory of Smart Grid of ministry of education Tianjin UniversityTianjin300072China Ability R&D Energy Research Centre School of Energy and EnvironmentCity University of Hong KongKowloonHong KongChina University of Technology of Belfort-Montbéliard CNRSInstitut FEMTO-STF-90010BelfortFrance ISEN Yncréa Ouest Brest UMR CNRS 6027 IRDL29200BrestFrance

Existing research on fault diagnosis for polymer electrolyte membrane fuel cells(PEMFC)has advanced significantly,yet performance is hindered by variations in data distributions and the requirement for extensive fault *** this study,a cross-domain adaptive health diagnosis method for PEMFC is proposed,integrating the digital twin model and transfer convolutional diagnosis model.A physical-based high-fidelity digital twin model is developed to obtain diverse and high-quality datasets for training diagnosis *** extract long-term time series features from the data,a temporal convolutional network(TCN)is proposed as a pre-trained diagnosis model for the source domain,with feature extraction layers that can be reused to the transfer learning *** is demonstrated that the proposed pre-trained model can hold the ability to accurately diagnose the various fuel cell faults,including pressure,drying,flow,and flooding faults,with 99.92%accuracy,through the effective capture of the long-term dependencies in time series ***,a domain adaptive transfer convolutional network(DATCN)is established to improve the diagnosis accuracy across diverse fuel cells by learning domain-invariant *** results show that the DATCN model,tested on three different target domain devices with adversarial training using only 10%normal data,can achieve an average accuracy of 98.5%(30%improved over traditional diagnosis models).This proposed method provides an effective solution for accurate cross-domain diagnosis of PEMFC devices,significantly reducing the reliance on extensive fault data.

关键词： Fuel cell Fault diagnosis Transfer learning Digital twins Cross-domain adaptation

Fabrication of pollution-free coal gangue-based catalytic material utilizing ferrous chloride as activator for efficient peroxymonosulfate activation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Coal science & Technology 2024年第1期11卷 103-118页

作者： zhiming Sun Xinlin Wang Shaoran Jia Jialin liang Xiaotian Ning Chunquan li School of Chemical and Environmental Engineering China University of Mining and Technology(Beijing)Beijing100083China key laboratory of Coal Processing and Efficient Utilization (China University of Mining and Technology)Ministry of EducationXuzhou221116China

Novel coal gangue-based persulfate catalyst(CG-FeCl_(2))was successfully synthesized by the means of calcinating under nitrogen atmosphere with the addition of ferrous chloride tetrahydrate(FeCl_(2)·_(4)H_(2)O).The phase transformation of the prepared materials and gas products during the heating process are thoroughly *** is suggested that ferrous chloride participated in the phase transformation and formed Si-O-Fe *** the main gaseous products are H_(2)O,H_(2),and HCl during the heating ***,the ability of CG-FeCl_(2) to activate peroxymonosulfate(PMS)for catalytic degradation of polycyclic aromatic hydrocarbons(PAHs)and phenol was deeply *** than 95%of naphthyl,phenanthrene and phenol were removed under optimizied *** addition,1O_(2),·OH,and SO_(4)·−were involved in the CG-FeCl_(2)/PMS system from the free radical scavenging experiment,where 1O_(2) played a major role during the oxidation ***,CG-FeCl_(2)/PMS system exhibited superior stability in a relatively wide pH range and the presence of common anion from related degradation ***,the novel CG-FeCl_(2) is an efficient and environmentally friendly catalyst,displaying potential application prospect in the field of PAHs and phenol-contaminated wastewater treatment.

关键词： Coal gangue Persulfate activation Advanced oxidation processes Polycyclic aromatic hydrocarbons Phenol Ferrous chloride

A Multi-strategy Improved Snake Optimizer Assisted with Population Crowding Analysis for Engineering Design Problems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2024年第3期21卷 1567-1591页

作者： Lei Peng Zhuoming Yuan Guangming Dai Maocai Wang Jian li zhiming Song Xiaoyu Chen School of Computer science China University of GeosciencesWuhan430074China Hubei key laboratory of Intelligent Geo-Information Processing China University of GeosciencesWuhan430074China china Astronautics Standards Institute Beijing100071China

Snake Optimizer(SO)is a novel Meta-heuristic Algorithm(MA)inspired by the mating behaviour of snakes,which has achieved success in global numerical optimization problems and practical engineering ***,it also has certain drawbacks for the exploration stage and the egg hatch process,resulting in slow convergence speed and inferior solution *** address the above issues,a novel multi-strategy improved SO(MISO)with the assistance of population crowding analysis is proposed in this *** the algorithm,a novel multi-strategy operator is designed for the exploration stage,which not only focuses on using the information of better performing individuals to improve the quality of solution,but also focuses on maintaining population *** boost the efficiency of the egg hatch process,the multi-strategy egg hatch process is proposed to regenerate individuals according to the results of the population crowding *** addition,a local search method is employed to further enhance the convergence speed and the local search *** is first compared with three sets of algorithms in the CEC2020 benchmark functions,including SO with its two recently discussed variants,ten advanced MAs,and six powerful CEC competition *** performance of MISO is then verified on five practical engineering design *** experimental results show that MISO provides a promising performance for the above optimization cases in terms of convergence speed and solution quality.

关键词： Snake optimizer Multi-strategy Population crowding analysis Engineering design problem

A ratiometric optical thermometer with dual-color emission based on Eu^(2+)-doped CsCu_(2)I_(3) microcrystals

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第8期42卷 1429-1436,I0001页

作者： Xiaorong li Ge gao Kaiyu Wang Zhaoqiong Chen Zejiang gao Qingyong Qin li Chen Bingsuo Zou State key laboratory of Featured Metal Materials and life-cycle Safety for Composite Structures School of Physical Science and TechnologyGuangxi UniversityNanning530004China School of Resources Environments and MaterialsGuangxi UniversityNanning530004China

With the increasing demand for non-co ntact fluorescence intensity ratio-based optical thermometry,novel phosphor materials with high-efficiency,dual-emitting centers,and differentiable temperature sensitivity are highly desired,In this wo rk,rare earth Eu^(2+) ions were incorporated Wnto CsCu_(2)I_(3) microcrystals by solidstate reaction,Under a single UV excitation,the as-synthesized samples exhibit two emissions:452 nm blue emission from the 5d→4f transition of Eu^(2+)and 582 nm yellow emission from self-trapped exciton e mission of CsCu_(2)I_(3).The photoluminescence quantum yield reaches to 50%,The dual-band emission of Eu^(2+)-doped CsCu_(2)I_(3) shows different temperature responses in the range of 260-360 *** on fluorescence intensity ratio technology,the maximum absolute sensitivity and re Iative sensitivity are 0.091 K^(-1)(at 360 K) and 2.60%/K(at 260 K),*** results suggest that Eu^(2+)-doped GsCu_(2)I_(3) could be a good candidate for highly sensitive optical thermometer.

关键词： CsCu_(2)I_(3) Eu^(2+)-doping Fluorescence intensity ratio Optical thermometer Rare earths

Spatiotemporal pattern of climate change in the china-Myanmar Economic Corridor from 1901 to 2018

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain science 2024年第1期21卷 131-145页

作者： YANG Xiaoliu li Yungang gao Lu Institute of Geography Fujian Normal UniversityFuzhou 350117China School of Geographical sciences Fujian Normal UniversityFuzhou 350117China Institute of International Rivers and Eco-Security Yunnan UniversityKunming 650500China Fujian Provincial Engineering Research Center for Monitoring and Accessing Terrestrial Disasters Fujian Normal UniversityFuzhou 350117China key laboratory for Humid Subtropical Eco-geographical Processes of the ministry of education Fujian Normal UniversityFuzhou 350117China

The china-Myanmar Economic Corridor(CMEC) is an important part of china's Belt and Road Initiative and an important area for global ecology and biodiversity. In this study, the annual and seasonal spatiotemporal patterns of temperature and precipitation in the CMEC over the past century were investigated using linear tendency estimation, the Mann-Kendall mutation test, the T-test, and wavelet analysis based on the monthly mean climatic data from 1901 to 2018 released by the Climatic Research Unit(CRU) of the University of East Anglia, UK. The results show that the CMEC demonstrated a trend of warming and drying over the past 100 years, and the rate of change in Myanmar was stronger than that in Yunnan Province of china. The warming rate was 0.039 ℃/10a. Precipitation decreased at a rate of -6.1 mm/10a. From the perspective of spatial distribution, temperature was high in the central and southern, low in the north of the CMEC, and the high-temperature centers were mainly distributed in the southern plain and river valley. Precipitation decreased from west to east and from south to north of the CMEC. From the perspective of the rate of change, warming was stronger in central and northern CMEC than in southern and northeastern CMEC. The rate of precipitation decline was stronger in the central and western regions than in the eastern region. This study provides a scientific reference for the CMEC to address climate change and ensure sustainable social and economic development and ecological security.

关键词： china-Myanmar Economic Corridor CRU Air temperature Precipitation Spatiotemporal pattern

Flow Field Simulation and Parameter Analysis of Hydraulic Unbalanced Bionic Self-recovery Actuator for Rotary Equipment

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2024年第1期21卷 325-343页

作者： Wei li Xin Pan Dehong Ge Jinji gao key laboratory of Engine Health Monitoring-Control and Networking of ministry of education Beijing University of Chemical TechnologyBeijing 100029China Beijing key laboratory of High-End Mechanical Equipment Health Monitoring and Self-Recovery Beijing University of Chemical TechnologyBeijing 100029China

The rotor is the most important component of rotating machinery,and the vibration produced by its mass unbalance has a serious influence on the secure and steady operation of the machine,so an effective online suppression technology is urgently needed.A new hydraulic unbalanced bionic self-recovery system is introduced,imitating the way of manually repairing faulty *** accomplish the effect of actuator mass redistribution,the technology employs pressurized air to drive the quantitative transfer of liquid in the reservoir cavity at opposite *** can complete the online adjustment of the equipment's balancing state and suppress the unbalanced vibration of equipment in real time,which gives the equipment the ability to maintain an autonomous health state and improve equipment *** composition and working principle of the system are introduced in detail,and the key performance parameters,such as the minimum running speed and the balancing liquid transfer speed,are analyzed *** fluid-solid coupling model of the actuator was established,and the two-phase flow from inside the hydraulic unbalanced bionic self-recovery actuator was simulated under multiple working conditions and the performance parameters were quantitatively analyzed.A balancing simulation test bed was built,and its effectiveness was verified by performance parameter tests and unbalanced bionic self-recovery *** experimental results show that the mass distribution adjustment of the balancing disk can be achieved using different viscosity balancing liquid,and the response of liquid viscosity 10 cSt is faster than that of liquid viscosity 100 cSt in the process of balancing liquid transfer,and the time is reduced by more than 75%;the system can reduce the simulated rotor amplitude from 18.3μm to 10.6μm online in real time,which provides technical support for the subsequent development of a new generation of bionic intelligent equipment.

关键词： Engineering self-recovery-Bionics Simulation analysis Self-recovery regulation

Implications of mosquito metabolism on vector competence

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect science 2024年第3期31卷 674-682页

作者： li gao Wenxu Yang Jingwen Wang State key laboratory of Genetic Engineering School of Life SciencesFudan UniversityShanghaiChina ministry of education key laboratory of Contemporary Anthropology School of Life SciencesFudan UniversityShanghaiChina

Mosquito-borne diseases(MBDs)annually kill nearly half a million *** to the lack of effective vaccines and drugs on most MBDs,disease prevention relies primarily on controlling *** huge efforts having been put into mosquito control,eco-friendly and sustainable mosquito-control strategies are still lacking and urgently *** mosquito-transmitted pathogens have lost the capacity of de novo nutrition biosynthesis,and rely on their vertebrate and invertebrate hosts for sustenance during the long-term obligate parasitism ***,a better understanding of the metabolic interactions between mosquitoes and pathogens will contribute to the discovery of novel metabolic targets or regulators that lead to reduced mosquito populations or vector *** review summarizes the current knowledge about the effects of mosquito metabolism on the transmission of multiple *** also discuss that research in this area remains to be explored to develop multiple biological prevention and control strategies for MBDs.

关键词： flaviviruses mosquito metabolism Plasmodium vector competence

Multiple Matching Attenuation Based on Curvelet Domain Extended Filtering

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Ocean University of china 2024年第4期23卷 924-932页

作者： HUA Qingfeng CHEN Zhang HE huili TAN Jun CHEN Haifeng li Guanbao SONG Peng ZHAO Bo JIANG Xiuping key laboratory of Marine Geology and Metallogeny First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China laboratory for Marine Mineral Resources Qingdao Marine Science and Technology CenterQingdao 266237China College of Marine Geoscience Ocean University of ChinaQingdao 266100China BGP Inc. China National Petroleum CorporationZhuozhou 072750China key laboratory of Submarine Geosciences and Prospecting Techniques Ministry of EducationQingdao 266100China

The paper develops a multiple matching attenuation method based on extended filtering in the curvelet domain,which combines the traditional Wiener filtering method with the matching attenuation method in curvelet ***,the method uses the predicted multiple data to generate the Hilbert transform records,time derivative records and time derivative records of Hilbert ***,the above records are transformed into the curvelet domain and multiple matching attenuation based on least squares extended filtering is ***,the attenuation results are transformed back into the time-space *** on the model data and field data show that the method proposed in the paper effectively suppress the multiples while preserving the primaries ***,it has higher accuracy in eliminating multiple reflections,which is more suitable for the multiple attenuation tasks in the areas with complex structures compared to the time-space domain extended filtering method and the conventional curvelet transform method.

关键词： multiple matching attenuation curvelet domain extended filtering